(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_sign_ed25519_pk_to_curve25519 — Convert an Ed25519 public key to a Curve25519 public key
Given an Ed25519 public key, calculate the birationally equivalent X25519 public key.
public_keyPublic key suitable for the crypto_sign functions.
Public key suitable for the crypto_box functions.